Function portable_float_to_bf16

support/Bfloat16.h:40–52

Convert float to bfloat16 in a portable way that works on older hardware * * @param[in] v Floating-point value to convert to bfloat * * @return Converted value */

 * @return Converted value
 */
inline uint16_t portable_float_to_bf16(const float v)
{
    const uint32_t *fromptr = reinterpret_cast<const uint32_t *>(&v);
    uint16_t        res     = (*fromptr >> 16);
    const uint16_t  error   = (*fromptr & 0x0000ffff);
    uint16_t        bf_l    = res & 0x0001;

    if ((error > 0x8000) || ((error == 0x8000) && (bf_l != 0)))
    {
        res += 1;
    }
    return res;
}

/** Convert float to bfloat16
 *